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The Evolutionary Host Switches of Polychromophilus: a Multi-Gene

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The Evolutionary Host Switches of Polychromophilus: a Multi-Gene Witsenburg et al. Malaria Journal 2012, 11:53 http://www.malariajournal.com/content/11/1/53 RESEARCH Open Access The evolutionary host switches of Polychromophilus: a multi-gene phylogeny of the bat malaria genus suggests a second invasion of mammals by a haemosporidian parasite Fardo Witsenburg1*, Nicolas Salamin1,2 and Philippe Christe1 Abstract Background: The majority of Haemosporida species infect birds or reptiles, but many important genera, including Plasmodium, infect mammals. Dipteran vectors shared by avian, reptilian and mammalian Haemosporida, suggest multiple invasions of Mammalia during haemosporidian evolution; yet, phylogenetic analyses have detected only a single invasion event. Until now, several important mammal-infecting genera have been absent in these analyses. This study focuses on the evolutionary origin of Polychromophilus, a unique malaria genus that only infects bats (Microchiroptera) and is transmitted by bat flies (Nycteribiidae). Methods: Two species of Polychromophilus were obtained from wild bats caught in Switzerland. These were molecularly characterized using four genes (asl, clpc, coI, cytb) from the three different genomes (nucleus, apicoplast, mitochondrion). These data were then combined with data of 60 taxa of Haemosporida available in GenBank. Bayesian inference, maximum likelihood and a range of rooting methods were used to test specific hypotheses concerning the phylogenetic relationships between Polychromophilus and the other haemosporidian genera. Results: The Polychromophilus melanipherus and Polychromophilus murinus samples show genetically distinct patterns and group according to species. The Bayesian tree topology suggests that the monophyletic clade of Polychromophilus falls within the avian/saurian clade of Plasmodium and directed hypothesis testing confirms the Plasmodium origin. Conclusion: Polychromophilus’ ancestor was most likely a bird- or reptile-infecting Plasmodium before it switched to bats. The invasion of mammals as hosts has, therefore, not been a unique event in the evolutionary history of Haemosporida, despite the suspected costs of adapting to a new host. This was, moreover, accompanied by a switch in dipteran host. Keywords: Polychromophilus, Malaria, Haemosporida, Chiroptera, Plasmodium, Host switch, Phylogenetic analysis, Outgroup selection Background Ceratopogonidae and Nycteribiidae respectively, while the Five genera belonging to the order of Haemosporida (Api- vectors of Nycteria and Rayella are unknown [1,2]. Culici- complexa) are known to infect mammals: Plasmodium, dae and Ceratopogonidae also act as vectors of the avian Hepatocystis, Polychromophilus, Nycteria and Rayella and saurian Haemosporida [1,3]. These shared vectors [1,2]. The dipteran vectors of the first three haemospori- suggest that haemosporidian parasites might have invaded dian genera are represented by Culicidae (Anopheles spp.), mammals multiple times during their evolution. On the other hand, the switch to mammals is thought to have * Correspondence: [email protected] been an evolutionary demanding process for the parasite 1Département d’Ecologie et Evolution, Université de Lausanne, Biophore, [4] and therefore a rare event [5]. UNIL-Sorge, 1015 Lausanne, Switzerland Full list of author information is available at the end of the article © 2012 Witsenburg et al; BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Witsenburg et al. Malaria Journal 2012, 11:53 Page 2 of 10 http://www.malariajournal.com/content/11/1/53 Molecular phylogenetic studies to date have been able hypotheses on its phylogenetic relationships: 1) it is to detect only a single host switching event to mammals: monophyletic with the mammalian Plasmodium/Hepato- mammalian Plasmodium and Hepatocystis,themain cystis clade with which it shares the vertebrate host type, mammal-infecting genera, had a common origin and or 2) it shares its most recent common ancestor with formed a monophyletic sister clade to sauropsid Plasmo- the subgenus Haemoproteus (Haemoproteus), which has dium [6,7]. However, these phylogenetic studies suffer a similar vector. The genus Haemoproteus contains two from incomplete taxon sampling with most investigations avian subgenera which have different vectors. H. (Para- including, besides the genera Plasmodium and Hepato- haemoproteus) spp. use biting midges as vectors, and H. cystis, only the avian Haemoproteus and Leucocytozoon. (Haemoproteus) spp. are transmitted by Hippoboscidae, Consequently, with no knowledge of the evolutionary ori- whose closest relatives are the bat flies [17]. A phylo- gin of the other mammalian haemosporidian groups (i.e. geny based on ultrastructure and life-history traits Rayella, Nycteria, Polychromophilus), a second move into grouped Polychromophilus together with both subgenera mammals cannot be excluded. of Haemoproteus [8]. However, two recent molecular One possible approach for resolving this standing ques- phylogenetic studies based on part of the cytochrome b tion is to select a haemosporidian genus that could poten- sequence both suggest, despite their different topologies, tially have switched to mammal hosts independently of a close relationship between Polychromophilus and saur- mammalian Plasmodium/Hepatocystis. A good candidate opsid Plasmodium [18,19]. This fact provides a third genus for this is Polychromophilus as it is well described, hypothesis: 3) Polychromophilus is monophyletic with with the majority of its life cycle well documented, includ- sauropsid Plasmodium (see Figure 2). ing its vector stage. Moreover, it infects mammals but is The aim of this study was to test these three hypoth- not transmitted by Culicidae like Plasmodium, nor Cerato- eses against each other. Though previous studies on the pogonidae like Hepatocystis, but by Nycteribiidae (Diptera: phylogenetic relationships of Polychromophilus have Hippoboscoidea). Furthermore, Polychromophilus’ verte- been done, all used only a single gene. Different genes in brate host species range is restricted to the insectivorous a single organism can show different evolutionary pat- bats (Microchiroptera). A phylogenetic analysis of Poly- terns and it is, therefore, recommended to use multiple chromophilus can, therefore, elucidate whether it arose genes for accurate relationship estimation [20]. The four through an independent switch to mammal hosts [8]. genes from three different genomes sequenced for this Only five species of Polychromophilus are known to study represent two species of Polychromophilus (being exist. While they can be distinguished by their slight differ- the two type species of the two proposed subgenera). ences in ultrastructure, they are mainly classified based on These sequences were subsequently combined with an host-type [9,10]. Landau et al. [10] proposed dividing the existing dataset of 60 species of Haemosporida to clarify genus into two subgenera based on their gametocyte mor- the phylogenetic relationships and gain insight into the phology: 1) the subgenus Polychromophilus,withP. (P.) evolutionary host switches of Polychromophilus. melanipherus as the type species, which has gametocytes similar to the type ‘malariae’; 2) the subgenus Bioccala Methods with type species Polychromophilus (B.) murinus whose Sample collection and preparation gametocytes resemble the benign tertian parasites of birds Four Miniopterus schreibersii (Schreibers’ bent-winged and reptiles (see Figure 1) [10]. Later, it was even sug- bat) were caught using mist nets in the entrance of an gested that the subgenus Bioccala be raised to genus level abandoned mine in western Switzerland under authoriza- [11]; however, this was not reflected in the literature [12]. tion 2203 issued by the Veterinarian Service of Canton Moreover, the morphological distinctions between the Vaud, Switzerland. Blood was obtained by puncturing the species have been described as ‘slight’ [9] and how well uropatagial vein with a 0.5 mm gauge needle (Neolus). they reflect the genetics of the genus has not been studied. The blood beads that consequently formed on the uropa- The Nycteribiidae vectors are also known as nycteribids tagium (between 10 and 30 μl total) were taken up in a or bat flies. These haematophagous flies are completely microvette with EDTA (Sarstedt) and stored at 4°C until adapted to a parasitic lifestyle in the fur of bats in that further analysis. Haemostatic cotton was applied on the they have lost their wings, have no or reduced eyes and punctured vein until the bleeding had stopped before possess hooking claws which allow them swift movements releasing any bats. through the fur [13,14]. Coradetti [15] was the first to One drop of blood was applied to a glass microscope detect sporozoites in their salivary glands and later studies slide for later visual identification of the parasite species. confirmed his finding [12,16]. After smearing the blood, the slide was dried and imme- When an evolutionary conservation of hosts is diately submerged in 100% methanol for fixation. Finally assumed, Polychromophilus’ unique host-vector combi- 5% Giemsa-staining was applied for one hour to stain the nation of Mammalia and Nycteribiidae gives rise to two cells. DNA was extracted from whole blood using the Witsenburg et al. Malaria Journal 2012, 11:53 Page 3 of 10
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